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"Cellular baseband devices typically maintain only one active connection at a time, either to a terrestrial cell tower or to a satellite. In most scenarios, a mobile network operator (MNO) subscriber—-such as a T-Mobile user—-whose phone is configured for satellite connectivity will attempt to connect to SpaceX satellites when terrestrial tower coverage is lost, ensuring the device can maintain a cellular connection.
Prior to November 26th 2024, SpaceX was not yet authorized to service these requests. SpaceX fielded and rejected hundreds of thousands of cellular attach requests per day from T-mobile cellular tablets and phones and logged those connection attempts. Logging includes hardware identifiers, network data, and physical location data associated with all requests. This is also true for any 3GPP R13 cell device that supports satellite connectivity, globally, for any carrier. SpaceX can negotiate, reject, and log all connection attempts when a device loses terrestrial service.
As of November 26th 2024, the FCC has authorized SpaceX to field T-mobile subscriber's requests in the United States. If a user's device is not authorized, whether or not it's from a T-mobile subscribed device or not, SpaceX still gets device, network, and physical location metadata......"
From here: https://yawnbox.is/blog/threat-modeling-starlink-satellite-cellular-risks/